US1563339A - Carburetor - Google Patents

Description

Dec. 1, 1925. 1,563,339 1 M. G. CHANDLER CARBURETOR Filed oct. 14. 1922 Wegm" IHIII! Patented Dec. 1, 1925.`

UNITE-D STATES l 1,563,339 PATENT OFFICE. f,

MILFORD G. CHANDLER, F CHICAGO, ILLINOIS, ASSIGNOR, BY MmNE ASSIGNIIES'TS, i i

`T0 CURTIS B. CAMP, TRUSTEE, OE OAX PARK, ILLINOIS- CBBURETOR. l

Application led October 14, 1922. Serial No. 594,523.

My `invention relates to carburetors ofy the type which have provision for rasing fuel from a low level supply tank tothe level of the carburetor by suction obtained 1I from lthe engine to which the carburetor is attached. y

.Certain features of my invention are ap.

plicable to carburetors of the type adalpted to receive their fuel by gravity How rom a tank at a higher level. Other features are applicable only to carburetors of the type in which the suction available within the mix-y ing chamber or the intake manifold is augmented for lifting fuel from -a low level sup ly to the level of the carburetor.

e advantages to be gained byl an augmented suction are fully set forth in my Patent No. 1,370,947, datedMarch -8, 1921, and such advantages, therefore, need not be restated here. l

A feature of my invention, and one which is applicable to oth gravity and vacuum fed carburetors, resides in the arrangement for delivering fuel to the .float chamber through a .centrally located tubular screen carried by a removable plug, the chamber for the screen or filter orming a column through the central part of tliefloatv cham- -ber b means of which the bowl of the float chamber cover. y A further feature of my mvention, and one which is ap licable to both gravityand vacuum fed car uretors, resides in the concham er may be readily attached tothe float My invention is illustrated in the accompanying drawings, in which Y. Figure 1 is a section through the induction passage and the oat chamber, the latter being .shown connected with a low= level source of fuel supply;

Figure 2 is an elevation; and

Flgure 3 is a section through the float valveseat, taken on the line 3 3 of Figure 1.

In the preferred embodiment of my inyention,` Ithe float chamber. cover 4 is cast integrally with the main housing 5, thus providing a structure` through which the various air and fuel passages may be con- 'veniently formd. Dependin from the iioat chamber cover is an integra tubular illar or hollow column 6 carrying a latera pro'- Jection 7 to which the float 8 is pivoted at 9. A valve member 10 has a Workingit within. a cylindrical bore or guide opening through a part of the lateral member 7 and' has a conical point 11 which forms a valve for closing the openi 12 leading from the transverse bore 13 which connects with, the hollow portion of the stem 6 into the milled slot 14. The float chamber bowl 16 is clamped against the cover 4 by means of 'the member 18, which 'is threaded into the hollow portion of theY lowerv end of the pillar 6. A tubular 'filter screen 19 is' carried upon a threaded plug 20, which is l screwed into the member 18, thus providing ready means for removing the screen for cleaning out sediment. Fuel delivery connectlon to the oat chamber is made through a fitting 21 threaded into an opening in the cover 4. i

The tloat chamber parts thus described operate in the lusual manner to maintain a substantially constant fuel level in the float chamber, whether fuel is fed thereto by gravity or by suction. Valve 10, being cylindrical instead of triangular or slotted as is customary, presents a -larger wearing surface to the y 'din opening in the projection 7 than `1s obtamed with theusual construction, thus preven leakage due to coeking of the valve, which is a source of trouble in many carburetors.

The construction of the carbureting a paratus embodied in the carburetory 5 has been described and claimed in my copending a plication Serial No. 736,258,

filed Septem r 6, 1924, this latter applica. p

aov

tion being divisional of the present application. e'

A vacuum Venturi tube 48 is fitted into an opening in the housing 5, so that its y discharge end lies. adjacent the outer surfaces o the valve member which `controls the main air entrance to the carbureting' chamber. As described in my copending application, this valve member is contoured so as to variably obstruct the discharge end of the Venturi tube 48 for differentpositions of the valve member controlling the main air entrance. The throat of the Venturi tube 48 is connected through a passage 49 with the upper part of the float chamber for'the purpose of creating a suction in the float chamber for drawing fuel thereto from a low level source of supply. The opening at the throat of the vacuum Venturi tube -48 is preferably made very small, its only function being to admit sulicent air to create an augmented suction in the float lchamber.

The flow of air through the Venturi tube 48 creates a suction upon the surface of the fuel in the float chamber. This suction being augmented by the Venturi tube 48 is about twice as great as that existing in the body of the carburetor at the opposite end of the Venturi tube 48. This suction is available for lifting fuel from the low` level supply tank to thev float chamber of the carburetor, but, as described in my copending ap lication,

this suction is of lesser degree t an that prevailing at the nozzle openings, whereby the feed of fuel to the nozzle openings-is always assured.V f

It will be understood. that many features4 of the invention herein described are applicable to carburetors of the 'gravity feed type, though some of the features are applica le only to carburetors of the suction feed type.

carburetor into one of the gravity feed type,

vit is necessar only that air be admitted to the -lioat c amer to prevent the suction therein from rising to as high proportions as-when the carburetor is used for suction delivery of fuel to the bowl.

While I have shown and described Vmy invention with res ect to certain details, it is to be understoo that these may be modified in many respects without departing from the ls irit or scope of my invention;

` What Ipcaim isz" f 1.-.InA a carburetor, the combination with 'an induction passage of a float chamber comprising fa 0 said. induction passage, a

extending downwardly from the cover of said float chamber, a member adapted to be attache'd tothe bottom of the hollow column and having an, abutment thereon forholdingthe 'bowl against the cover, a plug car- In order to4 convert thisV owl for lsuppl ing fuel to' i o ow column Lacasse riedby said member, 'a tubular screen exopening in communication with the hollow Y column outside the said screen, a valve `for controlling said opening, a pivoted float for controlling said valve, and afuel delivery connection through the said float chamber cover delivering inside the said tubular screen. l

2. A float ,chamber for cai'buretors comprising va cover having a tubular pillar eX- tending downwardly therefrom, a bowl, a member extending through a central opening in said bowl and attached to the lower end of said tubular pillar for holding the Abowl against the cover, a tubular screen within the tubular pillar removable through said member, and a fuel delivery port through said float chamber cover delivering within the said tubular screen 3. A float chamber for carburetors and the like comprising a cover, a bowl, a column extending downwardly fromv said cover into said bowl, screw-threaded means associated with said bowl for connecting to thelower end of said column for connecting said bowl and said cover together, a fuel inlet passageway in said column opening through the top of said cover, a boss extending laterally from said column, a lateral fuel passageway in said boss communieating with said fuel inlet passageway, a fuel port opening from said lateral fuel passageway into said bowl, a fuel valve controlling said port, and a float pivotally supported on said boss for actuating said valve. 4. A float chamber for carburetors and the like comprising a cover, a bowl, a hollow `column extending between the cover and the base of the bowl and lattached to leach for holding the bowl and cover together, a tubular screen within said hollow column, a fuel delivery port for delivering fuel within said lscreen and a float-controlled port betweenthe hollow column and the interior of the float chamber bowl, and aA float for y controlling saidport.

5. A, float chamber the like comprising a cover, a bowl, a hollow column extending between the cover and the base of the bowl for attaching the bowl and coverto ether, means for `delivering fuel into said ollow column, a port between the hollow `column and the float chamber bowl, a guided valve member controlling said port, a lateral passageway located between the said port and the guide for said glilnded valve memberk for the discharge of el from said .port into the float chamber,

land a float controlling said guided valve member.

6. A float chamber for carburetors and the like comprisin a cover, a bowl, a co1- umn 'extending ownwardly from said for carburetors 4and cover into said bowl, a fuel inlet passageway fuel valve controlling said port, and a Hoat in said column opening through the to of pivotally supported on said boss for actuatsaid cover, a boss ext-ending laterally rom ing said valve. 10 .said column, a lateral fuel passageway in In witness whereof, .I hereunto subscribe 5 said boss communicating with said fuel inlet my name this 3rd day of October, 1922.

passageway, a fuel port opening from said lateral fuel passageway into said bowl, a MILFORD Gr. CHANDLER.

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